I was driving down to Santa Barbara from the bay area, and was going about 100 in the middle of nowhere when my "service engine soon" light popped on. I arrived in Santa Barbara, left my car for a couple hours, then got back in and turned it on. The light was not illuminated any more. Do I have anything to be concerned about? Thanks!

First thing to do is to scan the code. If it went away, its probably not too much to worry about, but you want to know just in case. Could be crappy gas, O2 sensor being stupid, or a bunch of easy to fix issues. Either way, code first.

Happened to my 128i while on a vacation trip. Came on after about 3 hours cruising at 80 mph and stayed lit for two days. Then went off and my dealer found no codes by the time I got home about two weeks later.

Mine turned on a couple of weeks ago. Not sure what triggered it, micro filter due (which i already changed and reset light) DS mode stopped working (already fixed due only to some cut wires) Spark Plugs are due in 6k miles? Is there a way we can reset and turn OFF this Service Engine Soon light? Not sure